Why the Fairey III F was finally declared obsolete

Was the Fairey III F declared obsolete because spare parts were no longer available?

No; trained personnel were the tighter constraint, and compatible III F spares were still used to help maintain Swordfish aircraft overseas.

An audience member guesses that a lack of spares forced the Fairey III F out of service. The stronger constraint was the limited supply of pilots, observers, aircrew, and maintainers available for an old type during wartime mobilization. Parts still existed, and components shared through the long Fairey lineage did not immediately become useless. Some III F spares could even support Swordfish maintenance in the Middle East and Near East, illustrating the logistical value of design continuity.